Glauconitic Sandstone
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 in Quartz Sandstone
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
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Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Moss Agate
SiO2
mineral
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Possible chert or weathered quartzite fragment
Microcrystalline quartz (SiO₂), identification uncertain from the photograph
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous limestone / shell hash rock
Bioclastic limestone (calcarenite or coquina), dominantly CaCO₃
sedimentary
Moss Agate
Agate (Silicon Dioxide, SiO2) with dendritic inclusions
sedimentary
Chert (with Limestone and Iron Oxide staining)
Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Megalodon Shark Tooth
Otodus megalodon
fossil
Amber
Succinrite (Organic Gemstone)
mineraloid
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Fossiliferous Sandstone with Plant Remains
Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)
sedimentary
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Polished amber-colored stone, possibly chert or jasper
Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper
mineral
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (Fossiliferous)
Silicon dioxide (SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Iron oxide concretion (contains FeO(OH)·nH2O)
sedimentary
Petrified Palmwood
Palmoxylon (fossilized monocot xylem)
sedimentary
Hag Stone
Perforated Flint / Chert Node
sedimentary
Turtle Stone / Septarian Nodule (Water-worn)
Septarian Concretion
sedimentary
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Chert (Flint) with Iron Staining
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Calcite crystal
Calcite (calcium carbonate, CaCO₃)
mineral